diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index b025864..cbab1df 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -851,23 +851,35 @@
 
 
 /* Simplified asprintf. */
-char *kasprintf(gfp_t gfp, const char *fmt, ...)
+char *kvasprintf(gfp_t gfp, const char *fmt, va_list ap)
 {
-	va_list ap;
 	unsigned int len;
 	char *p;
+	va_list aq;
 
-	va_start(ap, fmt);
-	len = vsnprintf(NULL, 0, fmt, ap);
-	va_end(ap);
+	va_copy(aq, ap);
+	len = vsnprintf(NULL, 0, fmt, aq);
+	va_end(aq);
 
 	p = kmalloc(len+1, gfp);
 	if (!p)
 		return NULL;
-	va_start(ap, fmt);
+
 	vsnprintf(p, len+1, fmt, ap);
-	va_end(ap);
+
 	return p;
 }
+EXPORT_SYMBOL(kvasprintf);
 
+char *kasprintf(gfp_t gfp, const char *fmt, ...)
+{
+	va_list ap;
+	char *p;
+
+	va_start(ap, fmt);
+	p = kvasprintf(gfp, fmt, ap);
+	va_end(ap);
+
+	return p;
+}
 EXPORT_SYMBOL(kasprintf);